Level 1: Reasons why babies spit up milk It is a very common phenomenon for babies to spit up milk, but there may be many reasons for spitting up milk. One reason is that the feeding posture is incorrect, causing the baby to swallow too much air; another reason may be that the baby\’s digestion is not fully developed, leading to indigestion; and another reason may be overfeeding or feeding too fast. Parents need to observe carefully to find out the specific causes of spitting up and make targeted adjustments. Level 2: How to prevent your baby from spitting up milk Prevention is more important than treatment. Parents can take the following measures to prevent babies from spitting up milk: First, correct feeding posture is very important. breastfeeding